Samsung Galaxy smartphones feature a hidden, powerful diagnostic menu built directly into the One UI operating system. This system allows you to test hardware components, troubleshoot screen glitches, check battery health, and verify sensor functionality without visiting a repair shop.

Using the tool is free. Replacing a Galaxy S23 screen costs $200-$350. Always try the tool first.

Whether you are dealing with a flickering display, unresponsive touch zones, or simply buying a used device, this guide explains how to access and utilize the built-in diagnostic tools to fix and test your screen. How to Access the Secret Samsung Diagnostics Menu

Master the Secret Samsung Galaxy Diagnostics Screen: The Ultimate Troubleshooting Tool Fixer

If a test fails, try these quick fixes before spending money: A simple reboot clears bad memory.

The fastest way to test your Samsung screen is through the secret phone dialer code. This method bypasses the operating system layer to test the hardware directly. Step-by-Step Access Open the native on your Samsung Galaxy. Ensure you are on the Keypad tab. Type the following code exactly: *#0*#

You must trace your finger across every single square to turn them green.

Use diagnostics when you notice:

8 Dec 2025 — How to Check Display on Samsung Phones Using Secret Codes * You can test the display of your Samsung phone by using the code *#0*# Beebom Gadgets Self-Diagnose Your Samsung Phone

Not everyone wants to memorize secret codes. Samsung provides two user-friendly diagnostic methods that are accessible through the normal interface.